311871317 has 2 divisors, whose sum is σ = 311871318. Its totient is φ = 311871316.

The previous prime is 311871311. The next prime is 311871319. The reversal of 311871317 is 713178113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303839761 + 8031556 = 17431^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 311871317 - 2⁸ = 311871061 is a prime.

Together with 311871319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311871311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155935658 + 155935659.

It is an arithmetic number, because the mean of its divisors is an integer number (155935659).

Almost surely, 2^311871317 is an apocalyptic number.

It is an amenable number.

311871317 is a deficient number, since it is larger than the sum of its proper divisors (1).

311871317 is an equidigital number, since it uses as much as digits as its factorization.

311871317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 32.

The square root of 311871317 is about 17659.8787368430. The cubic root of 311871317 is about 678.1490297841.

The spelling of 311871317 in words is "three hundred eleven million, eight hundred seventy-one thousand, three hundred seventeen".